The longer he doesn't get stretched out, the more concerned I am about him as a prospect for this exact reason. They know something, and they may not like it.
He's outside the box of their typical 6'3 221lb college arm obviously but the usage is significantly different than anyone in the organization. They have other guys his size and age.
A huge part of my concern is the lack of arm issues throughout their system. There are the guys like Preillip and Canterino who were obvious risks but they seem to have a pretty good knack for not missing multiple years with their pitching prospects, trades notwithstanding.
If they have a good track record of prospects not getting injured, and treating a specific prospect with kid gloves, it's reason to be concerned. I would not be surprised if they sell high at the deadline.
We know they don't like high school pitchers, even if they take a shot on one every now and then.